Nature of Faith
For those who take from Christian doctrine only those things which they want, rely upon their own judgment rather than relying upon Faith. Thus, by this refusal of bringing into captivity every understanding unto the obedience of Christ, they are really more obedient to themselves than they are to God.
... Leo XIII,
If you only believe those parts of the Gospel that please you and reject those parts that displease you, then you believe more in yourselves than you do in the Gospel.
... St. Augustine
(Book 17: Contra Faustum Manich, ch.3)
Either we profess it (the Faith) in its entirety, or not at all.
... Benedict XV,
Ad Beatorum Apostolorum Principio